Plant variety of davidia involucrata named &#39;aya nishiki&#39;

ABSTRACT

A new plant variety of  Davidia involucrata  distinguished from its parents and all other varieties of  Davidia involucrata  of which I am aware by the broadly cream variegated leaf margins on spring foliage and mottled variegation on secondary foliage in summer and fall.

BOTANICAL CLASSIFICATION

Davidia involucrata (Baill.)

VARIETAL NAME

‘Aya Nishiki’

BACKGROUND OF THE INVENTION

The present invention relates to a new and distinct variety of Davidia involucrata, which was developed in a controlled breeding program in Kawaguchi City, Japan, by the originator Mr. Akira Shibamichi. The varietal denomination of the new variety is ‘Aya Nishiki’.

The genus Davidia is included in the family Davidiaceae, which comprises one genus and one species originating in Western China. Davidia involucrata is uncommon in its native habit of Western China. It generally has a habit of a 20 meter tall deciduous tree with a dominant central leader, branches thick, glabrous. Leaf color is green, depending on light intensity and cultural conditions. Leaves are generally broadly ovate, 8 to 24 cms long, cordate at base, dentate, glossy and glabrous above, densely gray tomentose beneath. Petioles are 4 to 5 cms long, red, flowers are about 2 cm wide, surrounded by 2 opposite, uneven sized, 8 to 16 cm long, pendulous, yellowish white involucral leaves. Plant blooms May to June on older, mature specimens often more than 20 years in age. Fruits are ellipsoid, about 2.5 cms long.

SUMMARY OF THE INVENTION

The new variety was discovered as an open pollinated seedling in a controlled planting of Davidia involucrata. The new variety differs from its parents in having broadly margined creamy white variegation on new foliage, followed by foliage with blue green, white and green mottled foliage. Asexual reproduction of the new variety in Kawaguchi City, Japan by grafting has confirmed that the distinctive characteristics of the new variety are stable and reproduced true to type in successive generations of asexual propagation.

COMPARISON WITH PARENTS

‘Aya Nishiki’ is distinguished from its parents and all other varieties of Davidia involucrata of which I am aware, including the specific variety, Davidia involucrata var. Vilmoriniana (not patented) by the broadly cream variegated leaf margins on spring foliage and mottled variegation on secondary foliage in summer and fall.

BRIEF DESCRIPTION OF ILLUSTRATIONS

The accompanying illustrations show a specimen of the new cultivar in a photo illustration as true to color as is reasonably possible to make in an illustration of this character.

FIG. 1 illustrates spring foliage of the new variety

FIG. 2 illustrates the summer foliage of the new variety

DETAILED DESCRIPTION OF THE NEW VARIETY

‘Aya Nishiki’ has not been observed under all possible environmental, cultural and light conditions. The following observations and descriptions are of plants grown in Kawaguchi City, Japan and Vacaville, Calif. In this description, color references are to The Royal Horticultural Society Colour Chart (2002) and terminology used in the color descriptions herein refers to plate numbers in this color chart. Phenotypic expression may vary with light intensity, cultural and environmental conditions.

-   Classification:     -   -   Botanical.—Davidia involucrata (Baill.).         -   Parentage.—Mother Plant: Davidia involucrata (unnamed,             unpatented) Father Plant: Davidia involucrata (unnamed,             unpatented).         -   Propagation.—Grafting. -   Plant:     -   -   Typical size.—20 meters tall.         -   Observed size.—1.5 meters tall.         -   Habit.—Upright, pyramidal. -   Branches:     -   -   Lateral branches.—8 to 10.         -   Size.—Diameter: Base 10 to 20 mm; apex 2 to 3 mm Color: Near             Grey-Brown Group N199A Texture: Glabrous Color of New             Shoots: Near Greyed Green Group 197B. -   Leaf:     -   -   Shape.—Broadly ovate. Base: Cordate to dentate Apex:             Acuminate.         -   Leaf size.—8 to 14 cms long and 5 to 8 cms wide.         -   Arrangement.—Alternate.         -   Margin.—Entire.         -   Texture/substance.—Glossy and glabrous above and densely             tomentose beneath.         -   Description of variegation on mature and young             foliage.—Initial growth in spring exhibits broadly marginal             variegation against a green background. Subsequent foliage             growth in summer exhibits mottled green and burgundy margins             with blue green colored central foliage.         -   Young foliage variegated margins.—Upper side: Near             Yellow-Green Group 150 D with occasional coloration of Red             Purple Group 68C-D Under side: Near Yellow-Green Group 150             B.         -   Width of variegation.—0.5 cm-2.5 cms.         -   Young foliage central.—Upper side: Near Green Group 133 C             with occasional Blue Green Group 121 C Underside: Blue Green             Group 121 C.         -   Mature foliage margins.—Upper side: Near Green Group 133 C             often with Greyed-Purple Group 186 B-C Under side: Near             Green Group 133 C Width of margin: 2-3 mms.         -   Transition zone between margins and central             coloration.—Color: Near White Group 155 A Width; 1-2 mms.         -   Mature foliage central.—Upper side: Near Green Group 133C-D             Under side: Near Green Group 133D.         -   Venation pattern.—Upper Surface: Impressed.         -   Petioles.—Size: 7.5 cms long; 1 to 2 mm wide Coloration:             Near Red-Purple Group 59A Texture: Smooth.         -   Internodes.—3 to 8 cms.         -   Hardiness.—USDA Zone 5 (−20° F. to −10° F.).         -   Vigor.—Moderate.         -   Pests/diseases.—None noted. -   Infloresence: None yet observed. 

1. A new and distinct Davidia involucrata plant of the variety substantially as shown and described. 